Capacities, AUDI A8 (4H_) From 2010, AUDI A8 Hybrid (4H_) From 2012
Features of the refrigerant system:
- Expansion Valve
- Depending on the vehicle equipment level with one or two evaporators
- Refrigerant pipe with inner heat exchanger.
- Dryer cartridge in fluid reservoir on condenser
- Denso A/C compressors with an A/C compressor regulator valve -N280-, refer to [For engine(s) BPY, CETA, CCTA, CDMA, CEPB] Description and Operation (vehicle-specific repair information).
| Vehicle model | Production period | Total quantity of oil in refrigerant circuit in cm (1) | Quantity of refrigerant oil in replacement compressor in cm (1) | Differing features of this refrigerant circuit | ||
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| Audi A8 | As of 03.10 | |||||
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130 (1) / - 10 |
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130 (1) / - 10 |
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| Audi A8 Hybrid | From January 2012 | 160 (1) / - 20 | 160 (1) / - 20 |
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For vehicles with 8 cylinders. Increase the refrigerant oil quantity from 130 cubic cm to 180 cubic cm in the refrigerant circuit for TDI engines for vehicles with VIN numbers from 4H_ BN 018846. To differentiate, the refrigerant quantity must be slightly reduced. Since the filling capacity information on the information label does not change, proceed as follows: For vehicles built through the designated VIN, check whether the refrigerant oil capacity was possibly filled during a previous workshop visit, if not, fill the refrigerant circuit with an additional 50 cubic cm of refrigerant oil. Next, write down the corresponding filling capacity for the refrigerant in the information label with a waterproof marker and fill the refrigerant circuit with the stated refrigerant quantity. Finally, document the performed changes in the vehicle data. For vehicles constructed within the applicable VIN range, check the specified filling capacity for the refrigerant in the information label and if necessary write down the corresponding quantities with a waterproof marker and then fill the refrigerant circuit with the specified refrigerant quantity.
The same refrigerant oil quantity is filled during production for the other engines as for vehicles with an 8 cylinder TDI engine through vehicles with the VIN 4H_ BN 018845. Vehicles with an 8 cylinder TDI engine starting from the VIN 4H_ 018846 are filled with a greater amount of refrigerant oil during production. This refrigerant oil quantity applies retroactively to all vehicles with an 8 cylinder TDI engine. If the refrigerant circuit is refilled or, for example, the A/C compressor is replaced after cleaning the refrigerant circuit for vehicles with an 8 cylinder TDI engine, check the refrigerant oil quantity in the refrigerant circuit (such as in open lines or component connections or above the A/C Service Station before filling with refrigerant) and refill it with the correct quantity if necessary. If the A/C compressor is replaced without a need to clean the refrigerant circuit, adjust the refrigerant oil quantity in the newly installed A/C compressor so that it corresponds with the quantity of oil that was poured out of the old A/C compressor (and if necessary fill for corresponding vehicles through the specified VINs above)REMOVAL AND INSTALLATION .
The reason for the different oil capacities inside the A/C compressor is due to the design of the A/C compressor (with or with an oil separator on the high pressure connection) or to the design of the refrigerant circuit if the A/C compressors are have the identical design. Pay attention to the different capacities. Too much oil in the circuit leads to higher pressures and reduces cooling performance of the system. Too little oil may lead to lubrication problems in the compressor.
These A/C compressors are available as replacement parts with different oil fill capacities, therefore note capacity on the A/C compressor and the exact part number.
Too much oil in the circuit leads to higher pressures and reduces cooling performance of the A/C system. Too little oil may lead to lubrication problems in the compressor, therefore note the specified refrigerant oil quantities.
A data plate may be attached to the A/C compressor by the manufacturer, indicating the part number and refrigerant oil quantity.
For all vehicles except for the Audi A8 Hybrid, the mechanically driven A/C compressors manufactured by "Denso" are installed. Compressors from other manufacturers may also be installed at a later time. Refer to [For engine(s) BPY, CETA, CCTA, CDMA, CEPB] Description and Operation (vehicle-specific Repair Information).
An electrically driven A/C compressor manufactured by "Denso" (electrical A/C compressor -V470- with A/C compressor control module -J842-) is installed at the start of production for the Audi A8 Hybrid. There is no A/C compressor regulator valve -N280- present in this A/C compressor.
A/C compressors with a refrigerant oil quantity of 200 cubic cm are installed at the start of production for Audi A8 Hybrid vehicles, shortly after the start of production, the refrigerant oil quantity is reduced to 160 cubic cm. Do not reduce the refrigerant oil quantity for a vehicle in which an A/C compressor with a refrigerant oil capacity of 200 cubic cm is installed. If for example the refrigerant circuit is flushed, a total capacity of 160 cubic cm of refrigerant must also be filled in the refrigerant circuit for this vehicle. The replacement A/C compressor already contains the correct amount of refrigerant oil.